I haven’t heard them, but given the small incremental differences from Luxman in the past: I’d consider a 508 or 509 as a more worthwhile upgrade, even if older series. The additional devices in the output stages can make the amp perform better with more troublesome speakers.
Luxman 505z
I haven't seen any reviews of the 505z on AG yet. I've read great things about the 507z and the 509z with regards to their new LIFES circuitry etc. They also have upgraded phono stages. I think Darko had requested one to review but he hasn't posted it yet. I have a 505uxii so I'm wondering if the 505z would be worth upgrading to. Has anyone here heard the 505z yet?
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